释义：plain（平的）的最高级形式； 双语释义：adj.(形容词)清晰的,明白的 clear; easy to see, hear, or understand朴素的,简单的,平常的 simple; without anything added; without decoration坦白的,坦率的,真诚的 showing clearly, honestly, and exactly what is thought or felt[A]完全的,十足的,彻底的 complete; undoubtedn.(名